"Sat, 03 Jan 1970 05:48:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
05:48:38
General datetime
1970-01-03 05:48:38Z
For Database
1970-01-03 05:48:38
For HTTP1.1
Sat, 03 Jan 1970 05:48:38 GMT